John Marston is a complex character. He was once an outlaw but then got caught up in trying to redeem himself. He had a family, and his relationship with his wife and son was a big part of his story. He was forced by the government to hunt down his former gang members. In the end, he sacrificed himself to save his family.
One popular theme is adventure. Arthur Morgan is often involved in various adventures in the game world, and in fanfiction, the reader can be part of those exciting escapades. Another theme is redemption. His complex character allows for stories where the reader helps him find redemption or he helps the reader in their own journey of self - discovery. And of course, there's the theme of romance, which is central to the 'arthur morgan x reader' concept, with different levels of intimacy and emotional connection being explored.
One common theme is the exploration of their unspoken bond. In the game, they share a connection, and in fanfic, this is often delved into deeper. Another theme is adventure. They are both characters used to a life of action in the wild west, so stories might involve them going on quests together.
The fact that they are both survivors in a tough world. In the Red Dead Redemption universe, they've both faced hardships. A fanfic can explore how they support each other, grow together, or even have conflicts based on their different experiences and personalities. This makes for a rich tapestry of stories. For example, they could go on adventures together, and we get to see how their relationship evolves during those times. It's also interesting to see how their relationship might be different from the more traditional relationships in the game. There are so many possibilities for the writer to explore different emotions, like loyalty, love, or even just mutual respect between them.
One idea could be that Arthur Morgan somehow gets transported to the RWBY universe. He could use his skills as a gunslinger and survivalist to help the RWBY characters in their battles against Grimm. Maybe he teams up with Ruby and teaches her some of his unique combat techniques.
In most cases, playing as undead John Marston isn't a feature in the story. The game developers likely had other creative directions for the gameplay and narrative.
The duration of John Marston's story in RDR2 depends on how you play. On average, it can take several dozen hours to complete his main storyline and related side quests.